It sounds like you're looking for a specific old mobile phone wallpaper or screensaver — likely from the era of Java (J2ME) phones, where "240x320" was a common resolution (portrait, often for Nokia or Sony Ericsson). The phrase "Tokyo city nights jar" probably refers to a .jar file (Java application) containing animated or static night city scenes of Tokyo.

Tokyo City Nights is a life simulation mobile game developed by Gameloft Japan

Even with the right tokyo city nights jar 240x320 free file, you might hit snags.

Since keypad-based phones are largely obsolete, most people interested in this title now use mobile emulators J2ME Loader (Android) or

Deep purples, electric blues, and vibrant pinks reflecting off rain-slicked asphalt.

Why seek out this specific resolution?